"One billion" not a threat...We largely already know who the much smaller percentage of people that "are" a real threat, and there are differerent agencies always "watching" 24/7...dozens of attacks have been prevented just in NYC alone, the UK just announced they thwarted 7 in the last 6 months. And where they're based in the Middle East is less of a challenge for us, as our intelligence and military are already largely aware, (along with the French who are actually bombing over there as we speak), and with many even advertising their allegiance on social media and other outlets. And there is more and more coming out about prior knowlege of these last attacks. The ones living and hiding in France and other countries are harder to pin down, but they have allowed them to infiltrate and have neglected taking actions to find out who they really are and what they're up to...so maybe a time to change strategy?